Yantra do what is described as psychedelic meditation music. From such a thing you can expect and will receive two slow-moving pieces of improvised performances which do that hypnotic transcendent thing of which I am so fond. These two pieces were recorded in 2016 at separate locations, and you can tell the difference in atmosphere of each piece. They do complement each other very well, however.
Because I don’t often listen to pure drone works, I don’t really have any reference points for you. That probably isn’t important anyway. If you’re in the mood to chill, this works very well.